* Replace password in file `config/dev.exs` with password you supplied in previous step (look for line like `password: "postgres"`)
* edit `/etc/postgresql/9.6/main/pg_hba.conf` (Assuming you have 9.6 version) and change the line:
+
```
local all postgres peer
```
+
to
+
```
local all postgres md5
```
+
don't forget to revert it in the later step so you won't have to enter password when accessing psql console.
* Create and update your database with `mix ecto.create && mix ecto.migrate`. If it gives errors, try running again, this is a known issue.
* Undo changes you made in `/etc/postgresql/9.6/main/pg_hba.conf` (replace `md5` with `peer`)